Fuel Injector On-Time Calibration Adjustment
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Solution Overview
Problem
Fuel injectors in internal combustion engines experience performance degradation over time due to wear and environmental factors, leading to suboptimal fuel delivery, which existing calibration methods fail to accurately account for, resulting in inefficiencies.
Innovation Solution
A system and method that calculates the actual fuel delivered by a fuel injector post-engine shutdown, using pressure drop measurements to determine a correction factor for the injector's on-time calibration, adjusting it to match the commanded fuel amount, thereby mitigating errors caused by performance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If original calibration values are used for fuel injector, then initial optimal performance is achieved, but performance degrades over time due to wear and environmental factors
Solution Approach 1:
The system performs feedback calibration by measuring actual fuel delivery against commanded fuel delivery, calculating deviation values, and adjusting on-time calibration accordingly. This closed-loop feedback mechanism continuously corrects calibration drift caused by wear and environmental factors, maintaining reliable fuel injector performance over extended periods.
Solution Approach 2:
The calibration system transitions from static original calibration values to dynamic adaptive calibration. The system continuously updates on-time calibration based on measured performance deviations, allowing the calibration to adapt and evolve with the fuel injector's changing characteristics over time, thereby extending the effective calibration validity period.
2Reliability
If fuel injector calibration is adjusted frequently, then optimal performance is maintained, but system complexity and calibration time increase
Solution Approach 1:
The system performs partial calibration adjustments by only modifying on-time calibration parameters when deviations exceed predetermined thresholds. This selective calibration approach maintains fuel delivery accuracy without requiring complete recalibration sequences, thereby reducing system complexity and calibration time while still achieving reliable performance.
3Reliability
If calibration adjustment is performed during engine operation, then real-time performance optimization is achieved, but fuel pressure stability and measurement accuracy decrease
Solution Approach 1:
The system performs calibration adjustments in advance during engine shutdown or idle periods when fuel pressure is stable and measurements are accurate. By preparing calibration corrections beforehand, the system can then apply these pre-calculated adjustments during normal operation without requiring real-time pressure stability, thereby achieving both measurement accuracy and operational continuity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach dynamically adjusts the fuel injector's calibration to ensure optimal fuel delivery, reducing errors and maintaining performance by analyzing deviations and applying correction factors based on trend and statistical analyses.
Implementation Method 1
providing a fuel injection value to initiate a fuel injection event for a fuel injector corresponding to a cylinder in response to the engine shutdown value; receiving a pressure value representing a fuel pressure over a period of time, which includes the fuel injection event; calculating an amount of fuel actually injected in response to the pressure value
Data Source
AI summary
The disclosure provides a system and method for determining an amount of fuel injected or delivered by a single fuel injector in an internal combustion engine by generating one fuel injection event after the engine has stopped operating. The fuel delivered is statistically analyzed in comparison with a commanded fuel delivery amounts to determine the suitability of fuel injector on-time calibration for the analyzed fuel injector. If the fuel delivered deviates from the commanded amount of fuel delivery by a predetermined value, the fuel injector on-time calibration for the analyzed fuel injector is changed.